The experimental results of micro-structure in grid-produced turbulence
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The variation of main turbulent quantities in an isotropic turbulent flow, such as the decay of turbulent energy and the variation of Taylor microscale of turbulence with time are obtained, by employing a hot-wire anemometer and a nearly isotropic turbulent flow which is produced by a gridscreen located at the entrance of the test section in a low-level turbulence and low-speed wind tunnel in Peking University. The experimental results of the decay of turbulent energy and the variation of Taylor microscale of turbulence with time at the whole period from initial to final stage, normalized in an non-dimensional form, are consistent quite well with the computational results by the theory of the statistical vorticity structure. The experimental results presented in this paper also agree with Townsend's results obtained in earlier years as well as with Bennett's in the seventy's.
Key Wordsgrid-produced turbulence decay of turbulent energy Taylor turbulence microscale low-turbulence wind tunnel
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